Table 2.
Results (inhibition zone expressed in mm) of the Kirby-Bauer assay testing the selected bacterial strains against four antibiotics.
| Antibiotics (30 µg) | ||||
|---|---|---|---|---|
| Bacterial Strains | Amikacin | Amoxycillin + Clavulanic Acid | Cefotaxime | Tetracycline |
| Staphylococcus aureus | 18 (S) | 20 (S) | 16 (I) | 12 (R) |
| Staphylococcus pseudointermedius | 19 (S) | 21 (S) | 23 (S) | 11 (R) |
| Streptococcus canis | 19 (S) | 21 (S) | 23 (S) | 20 (S) |
| Streptococcus pyogenes | 20 (S) | 23 (S) | 23 (S) | 20 (S) |
| Pseudomonas aeruginosa | 12 (R) | 20 (S) | 17 (I) | 12 (R) |
| Escherichia coli | 13 (R) | 22 (S) | 25 (S) | 21 (S) |
| Proteus mirabilis | 20 (S) | 22 (S) | 24 (S) | 20 (S) |
| Klebsiella pneumoniae | 15 (I) | 20 (S) | 24 (S) | 10 (R) |
Legend—S: susceptible; R: resistant; I: intermediate. Breakpoint values: amikacin ≤ 14 mm R, 15–16 mm I, ≥17 mm S; amoxicillin + clavulanic acid ≤ 19 mm R (staphylococci), ≤13 mm R (remaining bacteria), 14–17 mm I, ≥20 mm (staphylococci) S, ≥18 mm (remaining bacteria) S; cefotaxime ≤ 14 mm R, 15–22 mm I, ≥23 mm S; tetracycline ≤ 14 mm R, 15–18 mm I, ≥19 mm S.